Die Trennung des Niobs von Tantal durch Extraktion als Tributylammonium-Niobrhodanid

Extraction

“…The tributylammonium ion forms a CH2Cl2-soluble salt with the silversaccharin anion (621) and an isoamyl acetate-soluble salt with niobium thiocyanate anion (618). Anionic thiocyanates of Fe, Bi, Co, Pd, U02, Hg, Cu, and Cr form salts with tributylammonium ion extractable into dichloromethane; polysulfide, thiocarbonate, and thiomolybdate ions behave similarly (612).…”